Tripping arrangement for rotary intaglio-printing machines



Jan. 14, 1930. W M 1,743,257

TRIPPING ARRANGEMENT FOR ROTARY INTAGLIO PRINTING MACHINES Filed Feb. 16, 1928 45 combination with the impression cylinder Patented Jan. 14, 1930 {UNITED STATES PATENT OFFICE OTTMAB WILHELM, OF AUG-SBU RG, GERMANY, ASSIGNOB TO MASCHIN'ENFABRIK AUGSBUIB-G-NUEBNZBEBG, AKTIENGESELLSCHAFT, OF AUGSBURG, GERMANY, A COR- PORATION OF GERMANY TRIPPING ARRAIIGEMENT FOR BOTARY INTAGLIO-PRINTING MACHINES Application filed. February 16, 1928, Serial No. 254,721, and in Germany February 21, 1927. In intaglio printing machines now used displaced so as to thereby maintain constant inconvenience is experienced due to the fact the tensionofthe paper web. that upon tripping the impression cylinder 2. In intaglio printing machines, the comfrom the forme cylinder the paper web is bination with the impression cylinder and.

slackened. The tripping from and to the means for tripping the same, of a second 55 forme consequently results in alteration or cylinder over which passes the paper web, loss of registration which, particularly in the eccentric bearings for said cylinders, and concase of multi-colour printing machines, imneoting links between said bearings adapted pairs to a very. high degree the quality of to displace said second cylinder upon the 1 the printing. Upon the machine being retripping of said impression Cylinder so as to (33 started and the printing operation being thereby maintain constant the'tension of the re-commenced, it may be seen that the proper paper. registration has been disturbed. Intestimdny whereof I have affixed my This drawback is eliminated according to signature. I

the invention by the tension of the paper OTTMAR WILHELM. web' being equalized upon the tripping of the impression cylinder in such a manner as to maintain approximately the same paper tension when the impression cylinder is tripped to and from the forme. This compensation of the tension of the paper web may, for instance, be obtained by the adjustment, together with the impression cylinder, of a second cylinder over which the paper web passes, say either the drying cylinder or I the cooling cylinder, in such a manner as to v maintain the paper Web under tension. In this way any'ocourence of register difierences upon the tripping of the impression cylinder from and to the forme will be entirely 89 avoided.

The drawing shows by way of example one arrangement suitable for carrying out the invention. I The impression cylinder 11 and the heating cylinder 1) are both mounted in eccentric bearings 0 and (1 respectively which are connected together by rods e so that u n the lifting of the impression cylinder a, t e heat- 40 ing cylinder will positively be moved in such I a manner as to maintain the tension of the paper web f constant.

What I claim is:

1. In intaglio printing machines, the and means for tripping the same, of a second cylinder over which passes the paper web, and means so connecting said two cylinders that upon the tripping of said impression cylinder, said second cylinder is positively 

